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$50,000, $1m, or more... How much do you need to retire? New framework reveals calculations

Author
RNZ,
Publish Date
Mon, 22 Sept 2025, 8:58pm

$50,000, $1m, or more... How much do you need to retire? New framework reveals calculations

Author
RNZ,
Publish Date
Mon, 22 Sept 2025, 8:58pm

By Susan Edmunds of 

How much do you really need to save for retirement?

Is it $48,000 as suggested by the Massey University retirement spending guidelines for a one-person household living a 鈥渘o frills鈥 life in a provincial area?

Or $1 million, as mooted by those same guidelines, for a two-person house living a choices life in a main centre.

Or more 鈥 as suggested by Koura founder Rupert Carlyon?

The Retirement Income Interest Group 鈥 part of the New Zealand Society of Actuaries 鈥 has set out to attempt to answer the question.

It said there needed to be a single framework for consistent discussion of what would be an adequate retirement income, and this should be clearly communicated to KiwiSaver members.

The group said there were a few different ways income needs could be assessed.

It could be done based on actual spending of current retirees, as in the Massey guidelines, or hypothetical spending based on the cost of living.

But the data reported on actual spending was not representative of all retirees and the hypothetical basket was hard to interpret into the future.

Instead, calculating a replacement income rate would be more effective, they said.

With this method, a person would be deemed to have sufficient savings if their balance at retirement could generate 80% to 100% of their pre-retirement income, until they were at least 90.

That would mean a median earner would need savings of about $605,000 if their retirement spending was assumed to increase with inflation.

If it were to fall 2% per year, which is a pattern seen in retiree spending, the balance required for would be $375,000.

鈥淭hinking about it in that way is really consistent with the KiwiSaver Act itself which talks about trying to allow people to enjoy standards of living in retirement similar to those in pre-retirement,鈥 said group convenor Ian Perera.

He said it was likely that a 5% KiwiSaver contribution rate, matched by an employer, would deliver the target amount of income for most median-earners.

This was assessed using a 6% drawdown rule, which allows for spending to reduce over a person鈥檚 life.

A median earner needs about $605,000 in savings for 80% to 100% of pre-retirement income. Photo / 123rf
A median earner needs about $605,000 in savings for 80% to 100% of pre-retirement income. Photo / 123rf

At 4% plus 4%, which the settings are shifting towards, someone who joined the workforce in their early 20s and earned a median income throughout their life and invested in a balanced fund would have a replacement income ratio of 75%, he said.

It was likely to be higher in a growth fund, or if returns were higher than the modelling allowed for.

But he said most people were not investing continuously from 20 to 65. Many would take money out for a first home.

鈥淭hen you鈥檝e got less time to make up what you鈥檝e taken out. So that鈥檚 important and obviously there鈥檒l be various reasons why people might need to have a savings suspension. They might be taking a career break for family reasons or they might have lost their job.

鈥淭hese sorts of gaps definitely can have an impact on your replacement rate.鈥

He said someone who withdrew for a first home would only end up with about 60% of pre-retirement income at a 4% contribution rate.

鈥淚鈥檓 not saying that using KiwiSaver to buy a first home isn鈥檛 a good thing. We know from the work that the Retirement Commission has done that people who own their own homes are probably in a better position in retirement because the cost of rents are quite a bit higher than the cost of house maintenance and rates and that sort of thing. So It鈥檚 a good thing to do but it鈥檚 something you鈥檙e going to need to make some contributions to.鈥

The highest income 10% of earners could find they needed to save more than 5% for their own personal targets but they were more likely to have other investments and seek personal advice, anyway.

He said people who were lagging in their saving could make a higher level of contributions in the years before retirement, or retire later.

鈥淩etiring later may lead to over-saving with a high replacement income possibly available until age 100. However, these strategies cannot be relied on as health issues or employment situation may prevent working as late or at the same level as hoped for.鈥

He said when people knew the income level they wanted to generate, they could work back from that.

鈥淵ou have NZ Super which is going to provide a significant amount of that target income for most New Zealanders and I guess you have a gap on top of that.

鈥淚f you鈥檙e a high income earner then that gap is going to be larger because NZ Super doesn鈥檛 depend on how much income you earn before retirement. And conversely if you鈥檝e been earning something close to the minimum wage throughout your life then NZ Super provides quite a big chunk of that replacement income.鈥

He said Sorted鈥檚 retirement navigator tool, which allows people to work out how they could spend their KiwiSaver total, would help them to see the picture.

鈥淭here鈥檚 a variety of different options you could use... your spending tends to go down in real terms through retirement.

鈥淪ome people talk about the go-go, slow-go and no-go years of retirement. So when you first retire, a lot of people can be quite active. They might want to be doing holidays and things that they haven鈥檛 been able to do when they鈥檙e working.

鈥淏ut there comes a point where you slow down and you鈥檙e probably going to be less interested in or capable of doing certain activities.鈥

- RNZ

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